<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>封装AJAX</title>
</head>
<body>
  <script type='text/javascript' src='./utils/ajax.js'></script>
  <script type='text/javascript'>
    $.ajax({
      method: 'GET',
      url: 'http://localhost:3000/',
      successCB: function(res) {
        console.log(res)
      },
      timeout: 300,
      timeoutCB: function () {
        console.log('ajax timeout');
      }
    });
  </script>
</body>
</html>